package cn.tedu._03vehicle.base.filters;

import cn.tedu._03vehicle.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = {"/v1/vehicle/*"})
public class LoginCheckFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.debug("过滤器开始校验用户登录状态!");
        //1.类型转换, HttpServletRequest是ServletRequest的子类;
        //  此处要用到子类的一个方法，所以需要进行类型转换;
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //2.获取会话对象
        HttpSession session = request.getSession();
        //3.登录状态校验
        UserVO userVO = (UserVO) session.getAttribute("user");
        if (userVO != null){
            //有此行代码,代表放行，允许执行请求的资源
            //无此行代码,代表拦截,不允许执行请求的资源
            filterChain.doFilter(request, response);
        } else {
            //重定向到登录页面
            response.sendRedirect("/login.html");
        }
    }


    @Override
    public void destroy() {
        Filter.super.destroy();
    }
}

